The ESP32, An SDR In Itself
Perhaps probably the most well-known of all of the software-defined radio (SDR) receivers is the RTL-SDR, a digital TV receiver on which an undocumented function was discovered. Perhaps different radio-enabled chips even have the identical undocumented function? It appears within the case of some members of the ESP32 household, they do. It’s a discovery made independently in two locations, by Espargos, and a Reddit consumer by the name of h0m3us3r.
What’s occurring is that the undocumented mode faucets the I/Q stream off earlier than the WiFi modem, and this may be learn and processed by SDR software program on an exterior pc. The undocumented mode will be discovered on ESP32 chips with the sooner Tensilica {hardware} onwards, so the low energy Bluetooth solely chips or the non-radio-equipped P4 gained’t work. Sadly it’s additionally solely potential with the obtain aspect, with each 2.4 and 5 GHz bands being supported relying on the microcontroller in query.
This isn’t fairly the final goal SDR we received with the RTL-SDR, however there are nonetheless loads of makes use of to which it may be put. We’re curious as as to if somebody can implement the software program aspect of an SDR on the identical chip, however we’re guessing that could be past their capabilities. Either method, we’re trying ahead to what the neighborhood does with this new-found information.
